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annotate packages/kernel/current/include/sched.hxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
children 6ed91473a1cd
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1 #ifndef CYGONCE_KERNEL_SCHED_HXX
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2 #define CYGONCE_KERNEL_SCHED_HXX
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3
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4 //==========================================================================
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5 //
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6 // sched.hxx
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7 //
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8 // Scheduler class declaration(s)
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9 //
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10 //==========================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Red Hat eCos Public License
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15 // Version 1.1 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://www.redhat.com/
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): nickg
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38 // Contributors: nickg
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39 // Date: 1997-09-09
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40 // Purpose: Define Scheduler class interfaces
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41 // Description: These class definitions supply the internal API
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42 // used to scheduler threads.
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43 // Usage: #include <cyg/kernel/sched.hxx>
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //==========================================================================
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48
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49 #include <cyg/kernel/ktypes.h>
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50 #include <cyg/infra/cyg_ass.h> // assertion macros
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51
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52 // -------------------------------------------------------------------------
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53 // Scheduler base class. This defines stuff that is needed by the
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54 // specific scheduler implementation. Each scheduler comprises three
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55 // classes: Cyg_Scheduler_Base, Cyg_Scheduler_Implementation which
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56 // inherits from it and Cyg_Scheduler which inherits from _it_ in turn.
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57
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58 class Cyg_Scheduler_Base
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59 {
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60 friend class Cyg_HardwareThread;
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61 friend class Cyg_SchedThread;
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62
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63 protected:
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64 // The following variables are implicit in the API, but are
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65 // not publically visible.
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66
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67 static volatile cyg_ucount32 sched_lock // lock counter
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68 CYGBLD_ATTRIB_ASM_ALIAS( cyg_scheduler_sched_lock );
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69
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70 static Cyg_Thread *current_thread; // current running thread
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71
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72 static cyg_bool need_reschedule; // set when schedule needed
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73
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74 static cyg_ucount32 thread_switches; // count of number of thread switches
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75 };
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76
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77 // -------------------------------------------------------------------------
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78 // Include the scheduler implementation header
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79
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80 #include CYGPRI_KERNEL_SCHED_IMPL_HXX
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81
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82 // Do some checking that we have a consistent universe.
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83
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84 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE
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85 # ifndef CYGIMP_THREAD_PRIORITY
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86 # error Priority inheritance will not work without priorities!!!
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87 # endif
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88 # if CYG_SCHED_UNIQUE_PRIORITIES
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89 # error Priority inheritance needs non-unique priorities!!!
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90 # endif
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91 #endif
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92
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93 // -------------------------------------------------------------------------
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94 // Scheduler class. This is the public scheduler interface seen by the
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95 // rest of the kernel.
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96
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97 class Cyg_Scheduler
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98 : public Cyg_Scheduler_Implementation
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99 {
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100 friend class Cyg_Thread;
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101
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102 // This function is the actual implementation of the unlock
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103 // function. The unlock() later is an inline shell that deals
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104 // with the common case.
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105
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106 static void unlock_inner();
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107
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108 public:
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109
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110 CYGDBG_DEFINE_CHECK_THIS
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111
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112 // The following API functions are common to all scheduler
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113 // implementations.
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114
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115 // claim the preemption lock
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116 static void lock();
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117
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118 // release the preemption lock and possibly reschedule
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119 static void unlock();
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120
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121 // release the preemption lock without rescheduling
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122 static void unlock_simple();
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123
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124 // return a pointer to the current thread
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125 static Cyg_Thread *get_current_thread();
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126
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127 // Return current value of lock
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128 static cyg_ucount32 get_sched_lock();
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129
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130 // Return current number of thread switches
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131 static cyg_ucount32 get_thread_switches();
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132
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133 // Start execution of the scheduler
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134 static void start() __attribute__ ((noreturn));
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135
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136 // The only scheduler instance should be this one...
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137 static Cyg_Scheduler scheduler;
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138
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139 };
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140
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141 // -------------------------------------------------------------------------
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142 // This class encapsulates the scheduling abstractions in a thread.
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143 // Cyg_SchedThread is included as a base class of Cyg_Thread. The actual
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144 // implementation of the abstractions is in Cyg_SchedThread_Implementation
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145 // so this class has little to do.
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146
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147 class Cyg_SchedThread
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148 : public Cyg_SchedThread_Implementation
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149 {
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150 friend class Cyg_ThreadQueue_Implementation;
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151 friend class Cyg_Scheduler_Implementation;
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152
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153 Cyg_ThreadQueue *queue;
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154
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155
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156 public:
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157
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158 Cyg_SchedThread(Cyg_Thread *thread, CYG_ADDRWORD sched_info);
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159
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160 // Return current queue pointer
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161
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162 Cyg_ThreadQueue *get_current_queue();
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163
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164 // Remove this thread from current queue
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165 void remove();
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166
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167 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE
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168
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169 private:
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170
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171 // For all priority inheritance mechanisms we need to keep track of how
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172 // many mutexes we have locked, including one which we are waiting to
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173 // lock, because we can inherit priority while sleeping just prior to
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174 // wakeup.
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175 cyg_count32 mutex_count;
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176
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177 public:
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178 // Count and uncount the number of mutexes held by
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179 // this thread.
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180 void count_mutex() { mutex_count++; };
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181 void uncount_mutex() { mutex_count--; };
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182
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183 protected:
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184 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INHERITANCE_SIMPLE
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185
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186 // The simple priority inheritance mechanism simply needs
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187 // somewhere to store the base priority of the current thread.
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188
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189 cyg_priority original_priority; // our original priority
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190
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191 cyg_bool priority_inherited; // have we inherited?
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192
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193 #endif
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194
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195 public:
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196
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197 // Inherit the priority of the provided thread if it
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198 // has higher priority than this.
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199 void inherit_priority( Cyg_Thread *thread);
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200
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201 // Relay the priority of the ex-owner thread or from the queue if it
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202 // has a higher priority than ours.
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203 void relay_priority( Cyg_Thread *ex_owner, Cyg_ThreadQueue *pqueue);
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204
0
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205 // Lose priority inheritance
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206 void disinherit_priority();
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207
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208 #endif
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209
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210 };
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211
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212 // -------------------------------------------------------------------------
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213 // Simple inline accessor functions
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214
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215 inline Cyg_Thread *Cyg_Scheduler::get_current_thread()
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216 {
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217 return current_thread;
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218 }
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219
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220 // Return current value of lock
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221 inline cyg_ucount32 Cyg_Scheduler::get_sched_lock()
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222 {
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223 return sched_lock;
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224 }
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225
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226 // Return current number of thread switches
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227 inline cyg_ucount32 Cyg_Scheduler::get_thread_switches()
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228 {
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229 return thread_switches;
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230 }
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231
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232 // Return current queue pointer
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233 inline Cyg_ThreadQueue *Cyg_SchedThread::get_current_queue()
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234 {
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235 return queue;
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236 }
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237
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238 // -------------------------------------------------------------------------
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239 #endif // ifndef __SCHED_HXX__
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240 // EOF sched.hxx